EP3721612A1 - Processes for printing spot colors - Google Patents
Processes for printing spot colorsInfo
- Publication number
- EP3721612A1 EP3721612A1 EP18830334.1A EP18830334A EP3721612A1 EP 3721612 A1 EP3721612 A1 EP 3721612A1 EP 18830334 A EP18830334 A EP 18830334A EP 3721612 A1 EP3721612 A1 EP 3721612A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- color
- spot
- colors
- ink
- channels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 401
- 230000008569 process Effects 0.000 title claims abstract description 397
- 239000003086 colorant Substances 0.000 title claims abstract description 248
- 238000007639 printing Methods 0.000 title claims abstract description 65
- 239000000758 substrate Substances 0.000 claims description 10
- 239000000976 ink Substances 0.000 description 227
- 230000006872 improvement Effects 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
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- 230000007547 defect Effects 0.000 description 5
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- 238000006467 substitution reaction Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000007641 inkjet printing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
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- 239000012963 UV stabilizer Substances 0.000 description 1
- 235000021443 coca cola Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000003379 elimination reaction Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/54—Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/205—Ink jet for printing a discrete number of tones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2103—Features not dealing with the colouring process per se, e.g. construction of printers or heads, driving circuit adaptations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
- B41J2/211—Mixing of inks, solvent or air prior to paper contact
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6027—Correction or control of colour gradation or colour contrast
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6072—Colour correction or control adapting to different types of images, e.g. characters, graphs, black and white image portions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/62—Retouching, i.e. modification of isolated colours only or in isolated picture areas only
- H04N1/628—Memory colours, e.g. skin or sky
Definitions
- the present disclosure relates to processes for printing spot colors. More specifically, the present disclosure relates to processes for printing that employ two or more ink limits and two or more linearizations to a single spot color channel to allow a spot color to function as both a spot color and a process color corresponding to the applied ink limit and applied linearization. The present disclosure further relates to an ink jet printer that utilizes a specific ratio of spot color channels to process color channels according to the processes described herein.
- Ink jet printing systems are widely used in many different fields to produce printed images on a variety of substrates.
- Conventional color ink jet printers utilize basic process ink color sets, usually comprising from four to eight process colors, to form the color variations required to print the desired image.
- One of the well-known process ink color sets comprises four basic colors: cyan, yellow, magenta, and black, and is referred to as the CMYK color set or the CMYK process color method.
- the process colors in a process color set are used to produce a range of printed colors by combining various amounts of each of the process colors.
- the CMYK colors are not actually blended together to form the desired color.
- CMYKRGB and CMYKOG process color sets/methods
- the gamuts of most of these color sets are much smaller than the total range of colors that can be seen by the human eye.
- the gamuts of process color printers are smaller than the gamuts produced by traditional printing presses, such as offset, flexographic, gravure and screen printing presses. For example, flesh tone colors are not easily created using the CMYK color method, nor are fluorescent and metallic colors.
- spot colors also as “house colors” or “brand colors”
- spot colors are customer-specific multi-pigmented colors, often associated with a specific company, product, and/or brand name.
- Spot colors are generally formed at the molecular level and are made up by blending a variety of tints, hues and shades of colors. Examples include the precise hues of red and yellow used by Kodak ® , IBM ® Blue or Coca-Cola ® Red.
- Conventional ink color sets are usually unable to reproduce spot color vividness. This inability to reproduce spot colors may occur because in conventional process printing, every color is made up of overlapping process ink dots, as opposed to spot color printing, which involves application of solid areas of the pre-mixed spot colors.
- conventional printers may include several process color channels and a limited number of spot color channels (as compared to the number of process color channels). If an additional spot color is needed (as is often the case), one or more of the spot color channels must be flushed with cleaning solvents (often referred to as the "longstore process") and replaced with the new spot color.
- the longstore process is time consuming and generates waste of inks and cleaning solvents. Further, the increased use of cleaning solvents has a significant negative effect on printer life.
- U.S. Patent Application Publication No. 2012/0090488 discloses that spot colors reproduce high value brand colors to supplement conventional process colors for printed images and packaging.
- This publication also discloses that a printing press can utilize hi-fidelity process inks (with at least three unique colors and black) and spot colors for printing solid brand colors and for printing over other colors to produce wide-gamut, half-toned color reproductions.
- Other references also relate to expansion of color gamuts of conventional ink color sets and processes, many of which add process inks to the existing color set and some of which use process colors in attempts to simulate spot colors. Some references that disclose expanding color gamuts in such a way include US Patent Nos.
- U.S. Patent Application Publication No. 2017/0266981 discloses a color set of process colors and spot colors that utilize more spot colors than conventional printers to expand the color gamut.
- the publication also discloses that substitution of spot colors for process colors allows for more spot colors to be used in a color set, which reduces/eliminates the need for the longstore process.
- the publication further discloses a process for producing a printed image on a substrate (or producing a color set), comprising: selecting eight or fewer process colors from a known process ink color set; providing two or more spot colors, forming a color set comprising the process colors and the spot colors wherein the ratio of the number of spot colors to the number of process colors is at least 0.5:1; and optionally printing the image using the formed color set.
- This publication focuses on gamut expansion, durability, consistency, control, printer life, etc., and makes no mention of applying two or more ink limits and linearizations to a spot color channel to operate as a spot color or a process color.
- ink jet printer systems typically include a driver that provides one ink limit and one linearization for each color channel to control the amount of ink dispensed from a print head onto a media.
- a driver that provides one ink limit and one linearization for each color channel to control the amount of ink dispensed from a print head onto a media.
- the driver of the ink jet printer uses a pre-set ink limit and linearization for the specific media at the selected print quality and/or resolution.
- the ink jet printers are driven by dedicated raster image processing solution which gives the end user the ability to create custom ink limits and linearizations.
- these ink jet printing processes still limit the color channel to one link limit and one linearization for the chosen settings.
- the invention relates to a process for printing.
- the process comprises the steps of selecting eight or fewer process colors from a known process ink color set; providing eight or fewer color channels comprising the selected process colors from the known process ink color set; providing two or more color channels comprising spot colors, wherein one or more of the spot colors correspond to a non-selected process color of the known process ink color set, applying two or more ink limits to each color channel comprising the one or more spot colors, applying two or more linearizations to each color channel comprising the one or more spot colors, and optionally printing an image.
- the one or more spot colors are configured to operate as the spot color and the non-selected process color of the known process ink color set according to the applied ink limit and the applied linearization.
- a first ink limit corresponds to the non-selected process color of the known process ink color set and a second ink limit corresponds to the spot color.
- a first linearization corresponds to the non-selected process color of the known process ink color set and a second linearization corresponds to the spot color.
- a first ink limit and a first linearization are applied to each color channel for the one or more spot colors to produce a color set including the non-selected process color of the known process ink color set.
- a second ink limit and a second linearization are applied to each color channel comprising the one or more spot colors to produce a color set including the spot color.
- the ratio of the number of color channels for the spot colors to the number of color channels for the process colors is at least 0.5:1.
- the provided channels for the spot colors comprise an additional spot color channel.
- the additional spot color channel does not correspond to one of the non-selected process colors of the known process ink color set.
- at least two spot colors correspond to at least two non-selected process colors of the known process ink color set.
- the at least two spot colors may be spot yellow and spot black.
- one or more ink limits and one or more linearizations are applied to the color channels comprising the selected process colors.
- the invention in another embodiment, relates to a process for printing an image.
- the process comprises the steps of identifying a known process ink color set comprising at least four colors, selecting two or more process colors from the known process ink color set, substituting each of the selected process colors with a spot color corresponding to the selected process color from the known process ink color set, providing a color channel for each unselected process color and each spot color, determining if the spot color is operating as the selected process color or the spot color, and printing an image on a substrate.
- the color channel for the spot color cab be applied with a first ink limit and a first linearization corresponding to the selected process color.
- the color channel for the spot color can be applied with a second ink limit and a second linearization corresponding to the spot color.
- the color channel for the spot color is configured to operate as the selected process color when the first ink limit and the first linearization are applied.
- the color channel for the spot color is configured to operate as the spot color when the second ink limit and the second linearization are applied.
- the ratio of a number of substituted spot color channels to a number of process color channels is at least 0.5:1.
- the process may further comprise providing one or more color channels for additional spot colors.
- the additional spot colors do not substitute process colors from the known process ink color set.
- the printing step comprises printing the image using at least one unselected process color and at least one spot color.
- the invention relates to a process for printing an image from an ink jet printer.
- the process comprises the steps of providing one or more color channels comprising process colors selected from a known process ink color set, providing one or more color channels comprising spot colors wherein one or more of the spot colors correspond to a non-selected process color of the known process ink color set, applying one or more ink limits to the one or more spot color channels, applying one or more linearizations to the one more spot color channels, and printing an image to a substrate.
- the ratio of the number of channels comprising spot colors to the number of channels comprising process colors is at least 1:1.
- a first ink limit and a first linearization are applied to the one or more spot color channels to produce a non-selected process color from the known process ink color set.
- a second ink limit and a second linearization are applied to the one or more spot color channels to produce a spot color.
- the printer comprises at least three color channels and two or fewer of the channels comprise process colors.
- the printer comprises at least six channels wherein three or fewer of the channels comprise a process color and two or more of the channels comprise spot colors.
- the process further comprises applying one or more ink limits and one or more linearizations to the color channels comprising the selected process colors.
- the process further comprises providing one or more additional spot color channels, wherein the additional spot color channels do not correspond to one of the non-selected process colors of the known process ink color set.
- the present invention relates to a unique printing process that applies two or more ink limits and two or more linearizations to a spot color channel.
- the process enables a spot color to function as both a spot color and a process color corresponding to the applied ink limit and the applied linearization.
- the process allows an ink jet printer to utilize an increased number of spot color channels compared to process color channels since the spot color can replace the process color from a known process ink color set.
- a known process ink color set can have an increased number of spot colors which substitute or replace process colors in the known process ink color set.
- the increased use of spot colors in the known ink color set surprisingly and unexpectedly provides for a multitude of beneficial performance improvements when utilized in ink jet printing processes. While some conventional printing processes utilize a process that applies a single ink limit and a single linearization to each color channel, these conventional processes fail to achieve the aforementioned combination of advantageous improvements.
- the present invention also provides for increased printer spot color printing capability, e.g., the ability to utilize more spot color channels than conventional printers, for example more than two spot color channels, more than three spot color channels, more than four spot color channels, more than five spot color channels, or more than six spot color channels.
- spot color channels can entirely replace one or more process colors in a known process ink color set.
- the spot color can be employed as both a spot color and a process color.
- applying a first ink limit and a first linearization to the spot color channel produces a process color from a known process color ink set.
- applying a second ink limit and a second linearization to the spot color channel produces a spot color.
- This enables an ink jet printer to employ more spot color channels to improve a known process ink color set. That is, using the inventive process, the spot color channel can entirely replace a process color channel in a known process ink color set.
- the ratio of spot colors to process colors, as well as their respective color channels is at least 0.5:1.
- the number of spot colors is greater than or equal to the number of process colors.
- a highly durable image may be produced.
- This type of highly durable image may be particularly advantageous, for example, when employed in applications relating to large format signage, e.g., outdoor signage such as traffic signs. As described above, durability is particularly germane to traffic signage because of the strict regulations relating thereto.
- spot colors may contain higher stability pigments and/or UV stabilizers (as compared to the pigments of process colors), which may contribute to the improvements in performance characteristics of the image.
- the ink color sets produced by the inventive printing process provide for unexpected improvements in printed image consistency.
- Conventional images e.g., those printed using process ink color sets such as CMYK, suffer from defects such as banding and other types of color variations. In some cases, these types of defects are difficult to initially recognize due to the printing process (overlay of process ink spots) and/or the actual composition of the process color inks that are employed.
- defects e.g., banding and other types of color variation
- defects may be more recognizable. Because of this improved recognition, consistency and quality control of printed images are advantageously improved.
- the inventors have found that, because of the properties of the spot colors and the improved ease of making opacity adjustments, the use of the inventive ink color sets provides for better image control.
- the high amount of spot colors in the inventive ink color sets may be printed simply by setting the opacity (coverage) percentage to give a (single) solid color print.
- conventional process color sets often rely on the preset profiles, which must be calibrated on each specific substrate sheet.
- the inventive ink color sets and processes lead to surprising improvements in printer life and overall process efficiency, e.g., reduced ink waste and/or cleaning solvent waste. This benefit is especially relevant in instances where greater numbers of spot colors are required to print the image.
- the substitution of spot colors for process colors allows for more spot color channels to be used in a color set, which reduces/eliminates the need for the longstore process and provides for an additional benefit of improved printer life.
- conventional printing processes fail to recognize the effects of spot colors or the combination of spot colors and process colors on the resultant image.
- the present invention relates to a process for printing.
- the process includes the step of selecting eight or fewer process colors from a known process ink color set, providing eight or fewer color channels comprising the selected process colors.
- the process also includes the step of providing two or more color channels comprising spot colors wherein one or more of the spot colors correspond to a non-selected process color of the known process ink color set.
- the process includes the step of applying two or more ink limits to the color channel comprising the one or more spot colors and applying two or more linearizations to the color channel comprising the one or more spot colors.
- the spot color channel can be applied with a first ink limit and a first linearization corresponding to the non-selected process color, or the spot color channel can be applied with a second ink limit and a second linearization corresponding to the spot color.
- an image may be printed.
- the one or more spot colors channels is configured to operate as the spot color or the non-selected process color of the known process ink color set according to the applied ink limit and applied linearization to the color channel.
- the process can apply a first ink limit to the spot color channel corresponding to the non-selected process color of the known process ink color set and a second ink limit corresponding to the spot color.
- the process can apply a first linearization to the spot color channel corresponding to the non-selected process color of the known process ink color set and a second linearization corresponding to the spot color.
- applying the first ink limit and the first linearization to the spot color channel produces a color set or image including the non-selected process color of the known process ink color set.
- applying the second ink limit and the second linearization to the spot color channel produces a color set or image including the spot color.
- the process for printing an image includes identifying a known process ink color set comprising at least four colors, selecting two or more process colors from the known process ink color set, and substituting each of the selected process colors with a spot color corresponding to the selected process color from the known process ink color set.
- the process then includes a step for providing a color channel for each unselected process color and each spot color and determining if the spot color is operating as the selected process color or the spot color.
- An image may then be printed on a substrate. Based on the determination step, e.g., via the driver, the color channel for the spot color can be applied with a first ink limit corresponding to the selected process color or a second ink limit corresponding to the spot color.
- the color channel for the spot color can be applied with a first linearization corresponding to the selected process color or a second linearization corresponding to the spot color.
- the color channel for the spot color can be applied with different ink limits and different linearizations during the same process for printing an image to produce the spot color or the selected process color.
- the driver of the ink jet printer is capable of recognizing a spot color that replaces or substitutes the process color in a known process ink color set, or if the spot color is an additional color that does not replace a process color. If the spot color replaces a process color, the driver can apply two or more sets of ink limits and corresponding linearizations to the spot color channel to produce the desired color set. For example, the driver applies a first ink limit and a first linearization to the spot color channel to operate as the selected process color. Alternatively, the driver applies a second ink limit and a second linearization to the spot color channel to operate as the spot color. The driver can also apple one or more ink limits and one or more linearizations to the channel(s) comprising the unselected process color(s).
- the ratio of the number of spot colors to the number of process colors, and their respective color channels may be 0.5:1 or greater, e.g., 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1 or 10:1.
- the number of spot colors in the formed color set may be greater than (or optionally equal to) the number of process colors. These limits and ranges are applicable to the color sets/processes discussed herein. Once the desired ratio is determined, each of spot colors and/or process colors may occupy a single color channel.
- spot colors may occupy three or more channels of an eight channel printer, e.g., four or more, five or more, or six or more.
- the spot color channels can entirely replace the process color channels for a known process ink color set. This feature is a highly desired feature for traffic signage industry since more spot colors could be printed without the need to physically increase the ink channels.
- the known process ink color set provided in the color channels may vary widely.
- the known process ink color set comprises any number of known process colors, e.g., one or more, two or more, three or more, or four or more. Many process ink color sets are and have been in use for some time. Examples include the CMYK, CMYKOG, CMYKRGB, and CcMmYK color sets (where "c” and "m” refer to lighter shades of cyan and magenta, respectively). This listing is by no means limiting. Broadly speaking, the known process ink color set may be any color set that comprises a known process color. In one embodiment, the known process ink color set does not comprise any spot colors. In one embodiment, the known ink color set is the CMYK color set.
- the ink jet printers comprise, among other components, a plurality of color channels, e.g., at least three channels, at least four channels, at least five channels, at least six channels, at least seven channels, at least eight channels, at least nine channels, or at least ten channels.
- Each of the channels comprises or is associated with a respective ink or ink color, i.e., a spot color or a process color from a known ink color set.
- the channels may hold or contain the respective inks, which are used to create the images.
- the process colors from a known ink color set are provided in six or fewer channels, e.g., five or fewer, four or fewer, three or fewer, or two or fewer. In preferred embodiments, the process colors are provided four, three or two of the channels. In some embodiments, the spot colors are provided in two or more of the channels, e.g., three or more, four or more, five or more, six or more, seven of more, eight or more, nine or more, or ten or more. The number of channels that contain spot colors (and thus the number of spot colors used by the printer(s)) may be greater than the number of channels that contain process colors (and thus the number of process colors used by the printer(s)). In addition to the color channels, the inventive printers may further comprise other well-known printer componentry, e.g., drivers, cartridge adapters, dryers, etc.
- other well-known printer componentry e.g., drivers, cartridge adapters, dryers, etc.
- the ratio of channels comprising spot colors to the channels comprising process colors is as described herein with respect to the number of spot colors and process colors.
- the inventive printers lead to surprising improvements in printer life and overall process efficiency. For instance, in many applications, a greater number of spot colors are required to print an image. Because the inventive printers utilize a greater amount of spot color channels, the need to change out the channels, e.g., to remove one spot color and replace it with another, is minimized or eliminated. Accordingly, waste of ink and cleaning solvents that is required for channel change outs (the long store process) is also minimized or eliminated. Further, because use of the aggressive cleaning solvents may be reduced, there is an accompanying benefit in printer life.
- the present process advantageously uses a greater number of spot color channels
- the formed color set may comprise two spot colors and one process color; three spot colors and one process color; three spot colors and two process colors; four spot colors and one, two, or three process colors; five spot colors and one, two, three, or four process colors; or six spot colors and one, two, three, four, or five process colors.
- the formed color set comprises five spot colors and three process colors or six spot colors and two process colors. In each of these formed color sets, a color channel is provided for each of the respective process colors and spot colors.
- the spot color(s) correspond to one of the non-selected process colors of the known process ink color set.
- the spot color(s) substitute one or more of the colors that were originally in the known process color ink set, e.g., the spot color takes the place of the respective process color, as opposed to the mere addition of a spot color to a known process ink color set (wherein both the spot color and the corresponding process color exist in the color set). In this way, more spot color channels can be utilized in an ink jet printer.
- the spot color channels are employed as both spot colors and as process colors according to the applied ink limits and linearizations.
- at least some of the spot color channels serve as both the respective spot color and as the process color that was substituted (by the spot color).
- the respective spot color may be used where the related process color would have been previously used.
- the known process ink color set is the CMYK color set
- the Y and/or K color channels may be replaced by spot yellow and/or spot black color channels.
- the spot yellow color channel is used as both spot yellow and process color Y and the spot black color channel is used as both spot black and process color K.
- the inventors have found that by substituting several spot colors for the corresponding process colors, the color gamut can be advantageously expanded.
- the ink color set further comprises one or more additional spot color channels in addition to the spot color(s) that correspond to one of the non-selected colors of the known process ink color set.
- the additional spot color channel(s) do not correspond to one of the non- selected process colors of the known process ink color set.
- the additional spot color channel(s) may not be configured to serve as both a spot color and a process color.
- the additional spot color channel(s) may, in some instances, be configured to receive one or more ink limits and one or more linearizations to operate as the spot color or another color.
- the process of printing an image includes identifying a known process ink color set comprising at least four colors, selecting two or more process colors from the known process ink color set, substituting each of the selected process colors with a spot color corresponding to the selected process color from the known process ink color set, providing a color channel for each unselected process color and each spot color, determining if the spot color is operating as the selected process color or the spot color, and printing an image on a substrate.
- the color channel for the spot color is applied with a first ink limit and a first linearization corresponding to the selected process color and a second ink limit and a second linearization corresponding to the spot color.
- a unique process for printing is utilized.
- the process employs a driver that provides one or more ink limits and one or more linearizations to the color channel(s) including the one or more spot color(s).
- the spot color channel functions as a spot color or the substituted process color according to the applied ink limit and linearization.
- the substitution comprises the step of identifying one or more process colors that were selected for substitution and determining a substitute spot color corresponding thereto.
- the selected process colors are then substituted with the substitute spot color, e.g., the substitute spot color(s) take the place of the selected process color(s), thus forming the improved ink color set (as discussed herein).
- spot color ink may be made to be sufficiently transparent so as to facilitate its use for overprinting.
- the color channels for the spot colors of the ink color set comprise at least one channel for spot yellow and one channel for spot black (spot yellow and/or spot black).
- the inventive printing processes utilize a driver that is responsible for recognizing the colors of a color set and facilitating the printing operation.
- the driver is capable of recognizing each spot color as a corresponding member of the known process ink color set, and differentiating each spot color from the respective corresponding member of the known process ink color set.
- the driver is configured to employ the spot colors as both process colors and spot colors according the applied ink limit and applied linearization. The driver has the capability of employing the spot color as a substitute for a particular process color that is listed in a design file.
- the driver is capable of employing two or more ink limits and two or more linearizations to a spot color channel to enable the spot color operate as a process color or a spot color depending on the applied ink limit and linearization. If the driver determines that a color set requires the spot color to operate as a process color, the driver applies a first ink limit and a first linearization to the spot color channel corresponding to the non-selected process color of the ink color set. Similarly, if the driver determines that the color set requires the spot color operate as the spot color, the driver applies a second ink limit and a second linearization corresponding to the spot color.
- some of the spot colors channels may simply add to the color set.
- the spot colors may be present along with the corresponding member of the process ink set.
- an ink color set may comprise process color C (cyan) along with color channels for spot blue and spot red.
- the spot blue color is related to the C process color.
- some of the spot colors may not have a relationship to any of the process colors in the process ink set.
- an ink color set may comprise process colors C and M (magenta) along with spot black, spot yellow, and spot white. In such an ink color set, the spot colors are not directly related to the C and M process colors.
- the use of the printing process provides for the use of more spot colors in a printer.
- traffic signage printing there are at least four other (primary) spot colors including green (or Worboy green), red, blue and brown in traffic signage industry.
- the number of ink channels in printers is often limited, e.g., less than ten channels.
- process colors e.g., CMYK
- substitution of some process ink channels the spot color printing capability could be significantly improved as discussed herein.
- a stable printing system using well-known printing processes may be provided where spot colors may be printed as solids for logos and brand names, in tone scales for vignettes, and to provide high fidelity color images (with process colors).
- changes in a given print job will only require changing those print stations that have different spot colors contained in the next print job.
- the inventive printers do not comprise a sub-tank.
- a sub-tank is a container that is generally known to function as a reservoir to store a quantity of ink (in addition to the ink stored in the cartridge).
- each channel has a sub-tank associated therewith.
- the sub-tank(s) allows the printer to continue to print images when one or more channels are low on the respective ink cartridge.
- the printer can be configured to send an alarm when the respective channel is low on the respective ink.
- the sub-tank may allow the printer to continue to print while one or more of the channels is low on ink.
- the sub-tank(s) require a significant amount of space in the printer assembly.
- the sub-tank(s) increase waste during the longstore process, due to, inter alia, ink loss. Because the inventive printers effectively utilize spot colors as described, the long store process is reduced or eliminated and, beneficially, the increased waste associated with the sub-tank(s) can be avoided.
- Embodiment 1 A process for printing comprising: selecting eight or fewer process colors from a known process ink color set; providing eight or fewer color channels comprising the selected process colors from the known process ink color set; providing two or more color channels comprising spot colors, wherein one or more of the spot colors correspond to a non-selected process color of the known process ink color set; applying two or more ink limits to each color channel comprising the one or more spot colors; applying two or more linearizations to each color channel comprising the one or more spot colors; and optionally printing an image.
- Embodiment 2 An embodiment of embodiment 1, wherein each color channel comprising the one or more spot colors is configured to operate as the spot color and the non-selected process color of the known process ink color set according to the applied ink limit and the applied linearization.
- Embodiment 3 An embodiment of embodiments 1 and 2, wherein a first ink limit corresponds to the non-selected process color of the known process ink color set and a second ink limit corresponds to the spot color.
- Embodiment 4 An embodiment of any one of embodiments 1-3, wherein a first linearization corresponds to the non-selected process color of the known process ink color set and a second linearization corresponds to the spot color.
- Embodiment 5 An embodiment of any one of embodiments 3-4, wherein a first ink limit and a first linearization are applied to each color channel comprising the one or more spot colors to produce a color set including the non-selected process color of the known process ink color set.
- Embodiment 6 An embodiment of any one of embodiments 3-4, wherein a second ink limit and a second linearization are applied to each color channel comprising the one or more spot colors to produce a color set including the spot color.
- Embodiment 7 An embodiment of any one of embodiments 1-6, wherein a ratio of a number of color channels for the spot colors to a number of color channels for the process colors is at least 0.5:1.
- Embodiment 8 An embodiment of any one of embodiments 1-7, wherein the provided channels for the spot colors comprise an additional spot color channel, wherein the additional spot color channel does not correspond to one of the non-selected process colors of the known process ink color set.
- Embodiment 9 An embodiment of any one of embodiments 1-8, wherein at least two spot colors correspond to at least two non-selected process colors of the known process ink color set.
- Embodiment 10 An embodiment of embodiment 9, wherein the at least two spot colors are spot yellow and spot black.
- Embodiment 11 An embodiment of any one of embodiments 1-10, further comprising applying one or more ink limits and one or more linearizations to the color channels comprising the selected process colors.
- Embodiment 12 A process for printing an image comprising: identifying a known process ink color set comprising at least four colors; selecting two or more process colors from the known process ink color set; substituting each of the selected process colors with a spot color corresponding to the selected process color from the known process ink color set; providing a color channel for each unselected process color and each spot color; determining if the spot color is operating as the selected process color or the spot color; and printing an image on a substrate; wherein the color channel for the spot color is applied with a first ink limit and a first linearization corresponding to the selected process color; wherein the color channel for the spot color is applied with a second ink limit and a second linearization corresponding to the spot color.
- Embodiment 13 An embodiment of embodiment 12, wherein the color channel for the spot color is configured to operate as the selected process color when the first ink limit and the first linearization are applied.
- Embodiment 14 An embodiment of embodiment 12, wherein the color channel for the spot color is configured to operate as the spot color when the second ink limit and the second linearization are applied.
- Embodiment 15 An embodiment of any one of embodiments 12-14, further comprising applying an ink limit and a linearization to the channel comprising the unselected process colors.
- Embodiment 16 An embodiment of any one of embodiments 12-15, wherein the ratio of a number of substituted spot color channels to a number of process color channels is at least 0.5:1.
- Embodiment 17 An embodiment of any one of embodiments 12-16, further comprising providing one or more color channels for additional spot colors, wherein the additional spot colors do not substitute process colors from the known process ink color set.
- Embodiment 18 An embodiment of any one of embodiments 12-17, wherein the printing step comprises printing the image using at least one unselected process color and at least one spot color.
- Embodiment 19 A process for printing from an inkjet printer comprising: providing one or more color channels comprising process colors selected from a known process ink color set; providing one or more color channels comprising spot colors, wherein one or more of the spot colors correspond to a non-selected process color of the known process ink color set; applying one or more ink limits to the one or more spot color channels; applying one or more linearizations to the one more spot color channels; and printing an image to a substrate; wherein the ratio of the number of channels comprising spot colors to the number of channels comprising process colors is at least 1:1.
- Embodiment 20 An embodiment of embodiment 19, wherein a first ink limit and a first linearization are applied to the one or more spot color channels to produce a non-selected process color from the known process ink color set.
- Embodiment 21 An embodiment of any one of embodiments 19-20, wherein a second ink limit and a second linearization are applied to the one or more spot color channels to produce a spot color.
- Embodiment 22 An embodiment of any one of embodiments 19-21, wherein the printer comprises at least three color channels and two or fewer of the channels comprise process colors.
- Embodiment 23 An embodiment of any one of embodiments 19-22, wherein the printer comprises at least six channels and wherein three or fewer of the channels comprise a process color and two or more of the channels comprise spot colors.
- Embodiment 24 An embodiment of any one of embodiments 19-23, further comprising applying one or more ink limits and one or more linearizations to the color channels comprising the selected process colors.
- Embodiment 25 An embodiment of any one of embodiments 19-24, further comprising providing one or more additional spot color channels, wherein the additional spot color channels do not correspond to one of the non-selected process colors of the known process ink color set.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Textile Engineering (AREA)
- Ink Jet (AREA)
- Color Image Communication Systems (AREA)
- Color, Gradation (AREA)
- Manufacture Of Switches (AREA)
- Push-Button Switches (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
Description
Claims
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US201762595771P | 2017-12-07 | 2017-12-07 | |
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ATE320049T1 (en) | 1992-05-25 | 2006-03-15 | Canon Kk | IMAGING METHOD AND APPARATUS |
JP3466665B2 (en) * | 1992-07-28 | 2003-11-17 | キヤノン株式会社 | Image supply device and image processing method |
US5847729A (en) | 1993-06-14 | 1998-12-08 | Canon Kabushiki Kaisha | Ink-jet printing apparatus and method, and printed matter obtained thereby and processed article obtained from printed matter |
JPH079734A (en) * | 1993-06-14 | 1995-01-13 | Canon Inc | Ink jet printing device, printed matter, method and its processed article |
US6717699B1 (en) | 1999-01-29 | 2004-04-06 | Kimberly-Clark Worldwide, Inc. | Method for hybrid printing |
US7298531B2 (en) * | 2001-11-13 | 2007-11-20 | Eastman Kodak Company | Digital image optimization incorporating paper evaluation |
US6637860B1 (en) | 2002-05-13 | 2003-10-28 | Creo Srl | High throughput inkjet printer with provision for spot color printing |
US7715042B2 (en) * | 2003-02-06 | 2010-05-11 | Seiko Epson Corporation | Color separation into a plurality of ink components including primary color ink and spot color ink |
GB0321164D0 (en) * | 2003-09-10 | 2003-10-08 | Hewlett Packard Development Co | Methods,apparatus and software for printing location pattern |
DE102004001937B4 (en) | 2004-01-14 | 2013-09-26 | Heidelberger Druckmaschinen Ag | Process for the reproduction of spot colors with primary inks and secondary inks |
DE102004003300B4 (en) | 2004-01-22 | 2014-03-06 | Heidelberger Druckmaschinen Ag | Method for producing a proof for a printing process with more than four inks |
US20120090488A1 (en) | 2009-04-28 | 2012-04-19 | Sun Chemical Corporation | Methods and systems for multicolor process printing employing both process colors and spot colors in the process ink set |
EP2872947B1 (en) | 2012-07-13 | 2020-02-05 | Sun Chemical Corporation | Expanded color gamut |
JP2015008406A (en) * | 2013-06-25 | 2015-01-15 | 株式会社リコー | Image processing method, image processing device, and program |
US9562165B2 (en) * | 2013-12-27 | 2017-02-07 | Canon Kabushiki Kaisha | Ink set and ink jet recording method |
US8955940B1 (en) | 2014-03-27 | 2015-02-17 | Xerox Corporation | System and method for printing colors outside of a limited gamut |
GB2527495A (en) | 2014-05-20 | 2015-12-30 | Chesapeake Ltd | Ink set optimisation |
CN109302858A (en) | 2016-03-17 | 2019-02-01 | 艾利丹尼森公司 | Utilize the inkjet printing methods of integrated spot color and printing color |
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US11523030B2 (en) | 2022-12-06 |
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